二次喷雾造粒法制备石榴结构硅碳负极材料  

Preparation of pomegranate-like silicon-carbon anode materials by secondary spray granulation

作　　者：骆真 曹宏[2] 薛俊[2] LUO Zhen;CAO Hong;XUE Jun(Guizhou Meiling Power Sources Co.,Ltd.,Zunyi 563003,China;School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]贵州梅岭电源有限公司,贵州遵义563003 [2]武汉工程大学材料科学与工程学院,湖北武汉430205

出　　处：《应用科技》2023年第5期169-174,共6页Applied Science and Technology

基　　金：国家科技支撑计划项目(2013BAB07B05);湖北省自然科学基金项目(2014CFB788).

摘　　要：为进一步优化多孔类核壳结构硅碳负极材料的制备方法,通过“两步喷雾造粒、一步碳化成型”法制备出了具有石榴结构状的锂离子电池硅碳负极材料。采用X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microsope,SEM)和热重分析(thermogravimetric analysis,TGA)等方法对材料的物理性质进行了表征。为提升复合材料的导电性与结构稳定性,提升其充放电性能,将碳纳米管(canbon nano tube,CNT)导电剂与鳞片石墨与复合材料进行了复合,得到了Si@Pore-C/CNT/G@C复合材料。该材料在0.1 C的电流密度下,在50次充放电循环后具有高达95.6%的容量保持率,并且在经过97次较长循环后仍具有82.8%的容量保持率。所提出的制备方式简单高效,具有量产的潜力,无需使用酸碱刻蚀或其他牺牲模板,是一种绿色、高效的制备方案。In order to further optimize the preparation method of porous core-shell structure silicon carbon anode materials,the garnet structure silicon carbon anode materials for lithium ion batteries were prepared by the“two-step spray granulation and one-step carbonization molding”method.The physical properties of the materials were characterized using the methods such as X-ray diffraction(XRD),scanning electron microsope(SEM),and thermogravimetric analysis(TGA).Then,in order to improve the conductivity and structural stability of the composite and its charge and discharge performance,the carbon nanotubes(CNT)conductive agent and flake graphite were compounded with the composite to prepare Si@Pore-C/CNT/G@C compound materials.This material has a capacity retention rate of up to 95.6%after 50 cycles of charge and discharge at a current density of 0.1 C,and still has a capacity retention rate of 82.8%after 97 longer cycles.In addition,the proposed preparation method is simple and high-efficiency,having the potential of mass production.Besides,it does not require to use acid-base etching or other sacrificial templates.Therefore,it is a green and high-efficiency preparation scheme.

关 键 词：负极材料 硅碳复合材料 喷雾造粒 石榴结构 水性脲醛树脂 酚醛树脂 一步碳化 电化学性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]